diff --git a/docs/reference/first.md b/docs/reference/first.md
index 1f3cfd7..0a446db 100644
--- a/docs/reference/first.md
+++ b/docs/reference/first.md
@@ -2,28 +2,22 @@
 
 ## first
 
-Basis Function Combinator
+Function
 
-    ([a1 ...1] -- a1)
+Replace a list with its first item.
 
-Gentzen diagram.
+       [a ...]
+    --------------
+          a
 
 ### Definition
 
-if not basis.
-
-### Derivation
-
-if not basis.
-
-### Source
-
-if basis
-
-### Discussion
-
-Lorem ipsum.
+> [uncons] [pop]
 
 ### Crosslinks
 
-Lorem ipsum.
+[second]
+[third]
+[fourth]
+[rest]
+
diff --git a/docs/reference/first_two.md b/docs/reference/first_two.md
index b344485..aae4e70 100644
--- a/docs/reference/first_two.md
+++ b/docs/reference/first_two.md
@@ -2,28 +2,23 @@
 
 ## first_two
 
-Basis Function Combinator
+Function
 
-    ([a1 a2 ...1] -- a1 a2)
+Replace a list with its first two items.
 
-Gentzen diagram.
+       [a b ...] first_two
+    -------------------------
+               a b
 
 ### Definition
 
-if not basis.
-
-### Derivation
-
-if not basis.
-
-### Source
-
-if basis
-
-### Discussion
-
-Lorem ipsum.
+> [uncons] [first]
 
 ### Crosslinks
 
-Lorem ipsum.
+[first]
+[second]
+[third]
+[fourth]
+[rest]
+
diff --git a/docs/reference/flatten.md b/docs/reference/flatten.md
index 972d4a0..f92b4db 100644
--- a/docs/reference/flatten.md
+++ b/docs/reference/flatten.md
@@ -2,28 +2,44 @@
 
 ## flatten
 
-Basis Function Combinator
+Function
 
-\<{} \[concat\] step
+Given a list of lists, concatinate them.
 
-Gentzen diagram.
+### Example
+
+       [[1 2] [3 [4] 5] [6 7]] flatten
+    -------------------------------------
+              [1 2 3 [4] 5 6 7]
 
 ### Definition
 
-if not basis.
-
-### Derivation
-
-if not basis.
-
-### Source
-
-if basis
+> [\<\{\}] \[[concat]\] [step]
 
 ### Discussion
 
-Lorem ipsum.
+Note that only one "level" of lists is flattened.  In the example above
+`[4]` is not unquoted.
 
 ### Crosslinks
 
-Lorem ipsum.
+[concat]
+[first]
+[first_two]
+[fourth]
+[getitem]
+[remove]
+[rest]
+[reverse]
+[rrest]
+[second]
+[shift]
+[shunt]
+[size]
+[sort]
+[split_at]
+[split_list]
+[swaack]
+[third]
+[zip]
+
diff --git a/docs/reference/floor.md b/docs/reference/floor.md
index ad43575..ce65978 100644
--- a/docs/reference/floor.md
+++ b/docs/reference/floor.md
@@ -2,30 +2,12 @@
 
 ## floor
 
-Basis Function Combinator
+Basis Function
 
-Return the floor of x as an Integral.
-
-This is the largest integer \<= x.
-
-Gentzen diagram.
-
-### Definition
-
-if not basis.
-
-### Derivation
-
-if not basis.
-
-### Source
-
-if basis
+Return the largest integer \<= x.
 
 ### Discussion
 
-Lorem ipsum.
+This function doesn't make sense (yet) to have because there are (as yet)
+only integers in the system.
 
-### Crosslinks
-
-Lorem ipsum.
diff --git a/docs/reference/floordiv.md b/docs/reference/floordiv.md
index 31a973b..aab7027 100644
--- a/docs/reference/floordiv.md
+++ b/docs/reference/floordiv.md
@@ -2,28 +2,21 @@
 
 ## floordiv
 
-Basis Function Combinator
+Basis Function
 
-Same as a // b.
+I don't know why this is called "floor" div, I think it rounds its
+result down (not towards zero or up.)
 
-Gentzen diagram.
-
-### Definition
-
-if not basis.
-
-### Derivation
-
-if not basis.
-
-### Source
-
-if basis
+       a b floordiv
+    ------------------
+          (a/b)
 
 ### Discussion
 
-Lorem ipsum.
+All the division commands need to be revisited when the "numeric tower"
+for Thun gets nailed down.
 
 ### Crosslinks
 
-Lorem ipsum.
+[divmod]
+
diff --git a/docs/reference/fork.md b/docs/reference/fork.md
index 109aa77..375b87f 100644
--- a/docs/reference/fork.md
+++ b/docs/reference/fork.md
@@ -2,28 +2,25 @@
 
 ## fork
 
-Basis Function Combinator
+Combinator
 
-\[i\] app2
+Run two quoted programs in parallel and replace them with their results.
 
-Gentzen diagram.
+       ... [F] [G] fork
+    ----------------------
+           ... f g
 
 ### Definition
 
-if not basis.
-
-### Derivation
-
-if not basis.
-
-### Source
-
-if basis
+> \[[i]\] [app2]
 
 ### Discussion
 
-Lorem ipsum.
+The basic parallelism combinator, the two programs are run independently.
 
 ### Crosslinks
 
-Lorem ipsum.
+[cleave]
+[clop]
+[map]
+
diff --git a/docs/reference/fourth.md b/docs/reference/fourth.md
index 2ef7284..ca94147 100644
--- a/docs/reference/fourth.md
+++ b/docs/reference/fourth.md
@@ -2,28 +2,22 @@
 
 ## fourth
 
-Basis Function Combinator
+Function
 
-    ([a1 a2 a3 a4 ...1] -- a4)
+Replace a list with its fourth item.
 
-Gentzen diagram.
+       [a b c d ...] fourth
+    --------------------------
+              d
 
 ### Definition
 
-if not basis.
-
-### Derivation
-
-if not basis.
-
-### Source
-
-if basis
-
-### Discussion
-
-Lorem ipsum.
+> [rest] [third]
 
 ### Crosslinks
 
-Lorem ipsum.
+[first]
+[second]
+[third]
+[rest]
+
diff --git a/docs/reference/mkref/FuncRef.html b/docs/reference/mkref/FuncRef.html
index 1df36af..8625611 100644
--- a/docs/reference/mkref/FuncRef.html
+++ b/docs/reference/mkref/FuncRef.html
@@ -1062,154 +1062,135 @@ a F a</code></pre>
 <p><a href="#cmp">cmp</a> <a href="#ge">ge</a> <a href="#gt">gt</a> <a href="#le">le</a> <a href="#lt">lt</a> <a href="#ne">ne</a></p>
 <hr />
 <h2 id="first">first</h2>
-<p>Basis Function Combinator</p>
-<pre><code>([a1 ...1] -- a1)</code></pre>
-<p>Gentzen diagram.</p>
+<p>Function</p>
+<p>Replace a list with its first item.</p>
+<pre><code>   [a ...]
+--------------
+      a</code></pre>
 <h3 id="definition-33">Definition</h3>
-<p>if not basis.</p>
-<h3 id="derivation-3">Derivation</h3>
-<p>if not basis.</p>
-<h3 id="source">Source</h3>
-<p>if basis</p>
-<h3 id="discussion-31">Discussion</h3>
-<p>Lorem ipsum.</p>
+<blockquote>
+<p><a href="#uncons">uncons</a> <a href="#pop">pop</a></p>
+</blockquote>
 <h3 id="crosslinks-39">Crosslinks</h3>
-<p>Lorem ipsum.</p>
+<p><a href="#second">second</a> <a href="#third">third</a> <a href="#fourth">fourth</a> <a href="#rest">rest</a></p>
 <hr />
 <h2 id="first_two">first_two</h2>
-<p>Basis Function Combinator</p>
-<pre><code>([a1 a2 ...1] -- a1 a2)</code></pre>
-<p>Gentzen diagram.</p>
+<p>Function</p>
+<p>Replace a list with its first two items.</p>
+<pre><code>   [a b ...] first_two
+-------------------------
+           a b</code></pre>
 <h3 id="definition-34">Definition</h3>
-<p>if not basis.</p>
-<h3 id="derivation-4">Derivation</h3>
-<p>if not basis.</p>
-<h3 id="source-1">Source</h3>
-<p>if basis</p>
-<h3 id="discussion-32">Discussion</h3>
-<p>Lorem ipsum.</p>
+<blockquote>
+<p><a href="#uncons">uncons</a> <a href="#first">first</a></p>
+</blockquote>
 <h3 id="crosslinks-40">Crosslinks</h3>
-<p>Lorem ipsum.</p>
+<p><a href="#first">first</a> <a href="#second">second</a> <a href="#third">third</a> <a href="#fourth">fourth</a> <a href="#rest">rest</a></p>
 <hr />
 <h2 id="flatten">flatten</h2>
-<p>Basis Function Combinator</p>
-<p>&lt;{} [concat] step</p>
-<p>Gentzen diagram.</p>
+<p>Function</p>
+<p>Given a list of lists, concatinate them.</p>
+<h3 id="example-4">Example</h3>
+<pre><code>   [[1 2] [3 [4] 5] [6 7]] flatten
+-------------------------------------
+          [1 2 3 [4] 5 6 7]</code></pre>
 <h3 id="definition-35">Definition</h3>
-<p>if not basis.</p>
-<h3 id="derivation-5">Derivation</h3>
-<p>if not basis.</p>
-<h3 id="source-2">Source</h3>
-<p>if basis</p>
-<h3 id="discussion-33">Discussion</h3>
-<p>Lorem ipsum.</p>
+<blockquote>
+<p><a href="#section-16">&lt;{}</a> [<a href="#concat">concat</a>] <a href="#step">step</a></p>
+</blockquote>
+<h3 id="discussion-31">Discussion</h3>
+<p>Note that only one &#x201C;level&#x201D; of lists is flattened. In the example above <code>[4]</code> is not unquoted.</p>
 <h3 id="crosslinks-41">Crosslinks</h3>
-<p>Lorem ipsum.</p>
+<p><a href="#concat">concat</a> <a href="#first">first</a> <a href="#first_two">first_two</a> <a href="#fourth">fourth</a> <a href="#getitem">getitem</a> <a href="#remove">remove</a> <a href="#rest">rest</a> <a href="#reverse">reverse</a> <a href="#rrest">rrest</a> <a href="#second">second</a> <a href="#shift">shift</a> <a href="#shunt">shunt</a> <a href="#size">size</a> <a href="#sort">sort</a> <a href="#split_at">split_at</a> <a href="#split_list">split_list</a> <a href="#swaack">swaack</a> <a href="#third">third</a> <a href="#zip">zip</a></p>
 <hr />
 <h2 id="floor-1">floor</h2>
-<p>Basis Function Combinator</p>
-<p>Return the floor of x as an Integral.</p>
-<p>This is the largest integer &lt;= x.</p>
-<p>Gentzen diagram.</p>
-<h3 id="definition-36">Definition</h3>
-<p>if not basis.</p>
-<h3 id="derivation-6">Derivation</h3>
-<p>if not basis.</p>
-<h3 id="source-3">Source</h3>
-<p>if basis</p>
-<h3 id="discussion-34">Discussion</h3>
-<p>Lorem ipsum.</p>
-<h3 id="crosslinks-42">Crosslinks</h3>
-<p>Lorem ipsum.</p>
+<p>Basis Function</p>
+<p>Return the largest integer &lt;= x.</p>
+<h3 id="discussion-32">Discussion</h3>
+<p>This function doesn&#x2019;t make sense (yet) to have because there are (as yet) only integers in the system.</p>
 <hr />
 <h2 id="floordiv">floordiv</h2>
-<p>Basis Function Combinator</p>
-<p>Same as a // b.</p>
-<p>Gentzen diagram.</p>
-<h3 id="definition-37">Definition</h3>
-<p>if not basis.</p>
-<h3 id="derivation-7">Derivation</h3>
-<p>if not basis.</p>
-<h3 id="source-4">Source</h3>
-<p>if basis</p>
-<h3 id="discussion-35">Discussion</h3>
-<p>Lorem ipsum.</p>
-<h3 id="crosslinks-43">Crosslinks</h3>
-<p>Lorem ipsum.</p>
+<p>Basis Function</p>
+<p>I don&#x2019;t know why this is called &#x201C;floor&#x201D; div, I think it rounds its result down (not towards zero or up.)</p>
+<pre><code>   a b floordiv
+------------------
+      (a/b)</code></pre>
+<h3 id="discussion-33">Discussion</h3>
+<p>All the division commands need to be revisited when the &#x201C;numeric tower&#x201D; for Thun gets nailed down.</p>
+<h3 id="crosslinks-42">Crosslinks</h3>
+<p><a href="#divmod">divmod</a></p>
 <hr />
 <h2 id="fork">fork</h2>
-<p>Basis Function Combinator</p>
-<p>[i] app2</p>
-<p>Gentzen diagram.</p>
-<h3 id="definition-38">Definition</h3>
-<p>if not basis.</p>
-<h3 id="derivation-8">Derivation</h3>
-<p>if not basis.</p>
-<h3 id="source-5">Source</h3>
-<p>if basis</p>
-<h3 id="discussion-36">Discussion</h3>
-<p>Lorem ipsum.</p>
-<h3 id="crosslinks-44">Crosslinks</h3>
-<p>Lorem ipsum.</p>
+<p>Combinator</p>
+<p>Run two quoted programs in parallel and replace them with their results.</p>
+<pre><code>   ... [F] [G] fork
+----------------------
+       ... f g</code></pre>
+<h3 id="definition-36">Definition</h3>
+<blockquote>
+<p>[<a href="#i">i</a>] <a href="#app2">app2</a></p>
+</blockquote>
+<h3 id="discussion-34">Discussion</h3>
+<p>The basic parallelism combinator, the two programs are run independently.</p>
+<h3 id="crosslinks-43">Crosslinks</h3>
+<p><a href="#cleave">cleave</a> <a href="#clop">clop</a> <a href="#map">map</a></p>
 <hr />
 <h2 id="fourth">fourth</h2>
-<p>Basis Function Combinator</p>
-<pre><code>([a1 a2 a3 a4 ...1] -- a4)</code></pre>
-<p>Gentzen diagram.</p>
-<h3 id="definition-39">Definition</h3>
-<p>if not basis.</p>
-<h3 id="derivation-9">Derivation</h3>
-<p>if not basis.</p>
-<h3 id="source-6">Source</h3>
-<p>if basis</p>
-<h3 id="discussion-37">Discussion</h3>
-<p>Lorem ipsum.</p>
-<h3 id="crosslinks-45">Crosslinks</h3>
-<p>Lorem ipsum.</p>
+<p>Function</p>
+<p>Replace a list with its fourth item.</p>
+<pre><code>   [a b c d ...] fourth
+--------------------------
+          d</code></pre>
+<h3 id="definition-37">Definition</h3>
+<blockquote>
+<p><a href="#rest">rest</a> <a href="#third">third</a></p>
+</blockquote>
+<h3 id="crosslinks-44">Crosslinks</h3>
+<p><a href="#first">first</a> <a href="#second">second</a> <a href="#third">third</a> <a href="#rest">rest</a></p>
 <hr />
 <h2 id="gcd">gcd</h2>
 <p>Basis Function Combinator</p>
 <p>true [tuck mod dup 0 &gt;] loop pop</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-40">Definition</h3>
+<h3 id="definition-38">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-10">Derivation</h3>
+<h3 id="derivation-3">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-7">Source</h3>
+<h3 id="source">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-38">Discussion</h3>
+<h3 id="discussion-35">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-46">Crosslinks</h3>
+<h3 id="crosslinks-45">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="gcd2">gcd2</h2>
 <p>Basis Function Combinator</p>
 <p>Compiled GCD function.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-41">Definition</h3>
+<h3 id="definition-39">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-11">Derivation</h3>
+<h3 id="derivation-4">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-8">Source</h3>
+<h3 id="source-1">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-39">Discussion</h3>
+<h3 id="discussion-36">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-47">Crosslinks</h3>
+<h3 id="crosslinks-46">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="ge">ge</h2>
 <p>Basis Function Combinator</p>
 <p>Same as a &gt;= b.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-42">Definition</h3>
+<h3 id="definition-40">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-12">Derivation</h3>
+<h3 id="derivation-5">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-9">Source</h3>
+<h3 id="source-2">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-40">Discussion</h3>
+<h3 id="discussion-37">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-48">Crosslinks</h3>
+<h3 id="crosslinks-47">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="genrec">genrec</h2>
@@ -1232,15 +1213,15 @@ a F a</code></pre>
   == [I] [T] [R [P] i] ifte
   == [I] [T] [R P] ifte</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-43">Definition</h3>
+<h3 id="definition-41">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-13">Derivation</h3>
+<h3 id="derivation-6">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-10">Source</h3>
+<h3 id="source-3">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-41">Discussion</h3>
+<h3 id="discussion-38">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-49">Crosslinks</h3>
+<h3 id="crosslinks-48">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="getitem">getitem</h2>
@@ -1251,90 +1232,90 @@ a F a</code></pre>
 -------------------------
  a</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-44">Definition</h3>
+<h3 id="definition-42">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-14">Derivation</h3>
+<h3 id="derivation-7">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-11">Source</h3>
+<h3 id="source-4">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-42">Discussion</h3>
+<h3 id="discussion-39">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-50">Crosslinks</h3>
+<h3 id="crosslinks-49">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="grabn">grabN</h2>
 <p>Basis Function Combinator</p>
 <p>&lt;{} [cons] times</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-45">Definition</h3>
+<h3 id="definition-43">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-15">Derivation</h3>
+<h3 id="derivation-8">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-12">Source</h3>
+<h3 id="source-5">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-43">Discussion</h3>
+<h3 id="discussion-40">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-51">Crosslinks</h3>
+<h3 id="crosslinks-50">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="grba">grba</h2>
 <p>Basis Function Combinator</p>
 <p>[stack popd] dip</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-46">Definition</h3>
+<h3 id="definition-44">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-16">Derivation</h3>
+<h3 id="derivation-9">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-13">Source</h3>
+<h3 id="source-6">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-44">Discussion</h3>
+<h3 id="discussion-41">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-52">Crosslinks</h3>
+<h3 id="crosslinks-51">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="gt">gt</h2>
 <p>Basis Function Combinator</p>
 <p>Same as a &gt; b.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-47">Definition</h3>
+<h3 id="definition-45">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-17">Derivation</h3>
+<h3 id="derivation-10">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-14">Source</h3>
+<h3 id="source-7">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-45">Discussion</h3>
+<h3 id="discussion-42">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-53">Crosslinks</h3>
+<h3 id="crosslinks-52">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="help">help</h2>
 <p>Basis Function Combinator</p>
 <p>Accepts a quoted symbol on the top of the stack and prints its docs.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-48">Definition</h3>
+<h3 id="definition-46">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-18">Derivation</h3>
+<h3 id="derivation-11">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-15">Source</h3>
+<h3 id="source-8">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-46">Discussion</h3>
+<h3 id="discussion-43">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-54">Crosslinks</h3>
+<h3 id="crosslinks-53">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="hypot">hypot</h2>
 <p>Basis Function Combinator</p>
 <p>[sqr] ii + sqrt</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-49">Definition</h3>
+<h3 id="definition-47">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-19">Derivation</h3>
+<h3 id="derivation-12">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-16">Source</h3>
+<h3 id="source-9">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-47">Discussion</h3>
+<h3 id="discussion-44">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-55">Crosslinks</h3>
+<h3 id="crosslinks-54">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="i">i</h2>
@@ -1343,24 +1324,24 @@ a F a</code></pre>
 <pre><code>   [Q] i
 -----------
     Q</code></pre>
-<h3 id="source-17">Source</h3>
+<h3 id="source-10">Source</h3>
 <pre><code>combo(i, [list(P)|S], S, Ei, Eo) :- append(P, Ei, Eo).</code></pre>
-<h3 id="discussion-48">Discussion</h3>
+<h3 id="discussion-45">Discussion</h3>
 <p>This is probably the fundamental combinator. You wind up using it in all kinds of places (for example, the <code>x</code> combinator can be defined as <code>dup i</code>.)</p>
 <hr />
 <h2 id="id">id</h2>
 <p>Basis Function Combinator</p>
 <p>The identity function.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-50">Definition</h3>
+<h3 id="definition-48">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-20">Derivation</h3>
+<h3 id="derivation-13">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-18">Source</h3>
+<h3 id="source-11">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-49">Discussion</h3>
+<h3 id="discussion-46">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-56">Crosslinks</h3>
+<h3 id="crosslinks-55">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="ifte">ifte</h2>
@@ -1378,15 +1359,15 @@ a F a</code></pre>
 ... [else] [then] [...] [if] infra first choice i</code></pre>
 <p>Has the effect of grabbing a copy of the stack on which to run the if-part using infra.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-51">Definition</h3>
+<h3 id="definition-49">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-21">Derivation</h3>
+<h3 id="derivation-14">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-19">Source</h3>
+<h3 id="source-12">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-50">Discussion</h3>
+<h3 id="discussion-47">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-57">Crosslinks</h3>
+<h3 id="crosslinks-56">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="ii">ii</h2>
@@ -1395,15 +1376,15 @@ a F a</code></pre>
 ------------------
  ... Q a Q</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-52">Definition</h3>
+<h3 id="definition-50">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-22">Derivation</h3>
+<h3 id="derivation-15">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-20">Source</h3>
+<h3 id="source-13">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-51">Discussion</h3>
+<h3 id="discussion-48">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-58">Crosslinks</h3>
+<h3 id="crosslinks-57">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="infra">infra</h2>
@@ -1412,26 +1393,26 @@ a F a</code></pre>
 <pre><code>   ... [a b c] [Q] infra
 ---------------------------
     c b a Q [...] swaack</code></pre>
-<h3 id="definition-53">Definition</h3>
+<h3 id="definition-51">Definition</h3>
 <pre><code>swons swaack [i] dip swaack</code></pre>
-<h3 id="discussion-52">Discussion</h3>
+<h3 id="discussion-49">Discussion</h3>
 <p>This is one of the more useful combinators. It allows a quoted expression to serve as a stack for a program, effectively running it in a kind of &#x201C;pocket universe&#x201D;. If the list represents a datastructure then <code>infra</code> lets you work on its internal structure.</p>
-<h3 id="crosslinks-59">Crosslinks</h3>
+<h3 id="crosslinks-58">Crosslinks</h3>
 <p><a href="#swaack">swaack</a></p>
 <hr />
 <h2 id="infrst">infrst</h2>
 <p>Basis Function Combinator</p>
 <p>infra first</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-54">Definition</h3>
+<h3 id="definition-52">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-23">Derivation</h3>
+<h3 id="derivation-16">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-21">Source</h3>
+<h3 id="source-14">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-53">Discussion</h3>
+<h3 id="discussion-50">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-60">Crosslinks</h3>
+<h3 id="crosslinks-59">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="inscribe">inscribe</h2>
@@ -1441,30 +1422,30 @@ a F a</code></pre>
 <p>[sqr dup mul] inscribe</p>
 </blockquote>
 <p>Gentzen diagram.</p>
-<h3 id="definition-55">Definition</h3>
+<h3 id="definition-53">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-24">Derivation</h3>
+<h3 id="derivation-17">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-22">Source</h3>
+<h3 id="source-15">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-54">Discussion</h3>
+<h3 id="discussion-51">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-61">Crosslinks</h3>
+<h3 id="crosslinks-60">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="le">le</h2>
 <p>Basis Function Combinator</p>
 <p>Same as a &lt;= b.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-56">Definition</h3>
+<h3 id="definition-54">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-25">Derivation</h3>
+<h3 id="derivation-18">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-23">Source</h3>
+<h3 id="source-16">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-55">Discussion</h3>
+<h3 id="discussion-52">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-62">Crosslinks</h3>
+<h3 id="crosslinks-61">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="loop">loop</h2>
@@ -1478,120 +1459,120 @@ a F a</code></pre>
 ------------------------
    ...</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-57">Definition</h3>
+<h3 id="definition-55">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-26">Derivation</h3>
+<h3 id="derivation-19">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-24">Source</h3>
+<h3 id="source-17">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-56">Discussion</h3>
+<h3 id="discussion-53">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-63">Crosslinks</h3>
+<h3 id="crosslinks-62">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="lshift">lshift</h2>
 <p>Basis Function Combinator</p>
 <p>Same as a &lt;&lt; b.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-58">Definition</h3>
+<h3 id="definition-56">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-27">Derivation</h3>
+<h3 id="derivation-20">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-25">Source</h3>
+<h3 id="source-18">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-57">Discussion</h3>
+<h3 id="discussion-54">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-64">Crosslinks</h3>
+<h3 id="crosslinks-63">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="lt">lt</h2>
 <p>Basis Function Combinator</p>
 <p>Same as a &lt; b.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-59">Definition</h3>
+<h3 id="definition-57">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-28">Derivation</h3>
+<h3 id="derivation-21">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-26">Source</h3>
+<h3 id="source-19">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-58">Discussion</h3>
+<h3 id="discussion-55">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-65">Crosslinks</h3>
+<h3 id="crosslinks-64">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="make_generator">make_generator</h2>
 <p>Basis Function Combinator</p>
 <p>[codireco] ccons</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-60">Definition</h3>
+<h3 id="definition-58">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-29">Derivation</h3>
+<h3 id="derivation-22">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-27">Source</h3>
+<h3 id="source-20">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-59">Discussion</h3>
+<h3 id="discussion-56">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-66">Crosslinks</h3>
+<h3 id="crosslinks-65">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="map">map</h2>
 <p>Basis Function Combinator</p>
 <p>Run the quoted program on TOS on the items in the list under it, push a new list with the results in place of the program and original list.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-61">Definition</h3>
+<h3 id="definition-59">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-30">Derivation</h3>
+<h3 id="derivation-23">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-28">Source</h3>
+<h3 id="source-21">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-60">Discussion</h3>
+<h3 id="discussion-57">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-67">Crosslinks</h3>
+<h3 id="crosslinks-66">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="max">max</h2>
 <p>Basis Function Combinator</p>
 <p>Given a list find the maximum.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-62">Definition</h3>
+<h3 id="definition-60">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-31">Derivation</h3>
+<h3 id="derivation-24">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-29">Source</h3>
+<h3 id="source-22">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-61">Discussion</h3>
+<h3 id="discussion-58">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-68">Crosslinks</h3>
+<h3 id="crosslinks-67">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="min">min</h2>
 <p>Basis Function Combinator</p>
 <p>Given a list find the minimum.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-63">Definition</h3>
+<h3 id="definition-61">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-32">Derivation</h3>
+<h3 id="derivation-25">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-30">Source</h3>
+<h3 id="source-23">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-62">Discussion</h3>
+<h3 id="discussion-59">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-69">Crosslinks</h3>
+<h3 id="crosslinks-68">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="mod">mod</h2>
 <p>Basis Function Combinator</p>
 <p>Same as a % b.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-64">Definition</h3>
+<h3 id="definition-62">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-33">Derivation</h3>
+<h3 id="derivation-26">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-31">Source</h3>
+<h3 id="source-24">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-63">Discussion</h3>
+<h3 id="discussion-60">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-70">Crosslinks</h3>
+<h3 id="crosslinks-69">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="modulus">modulus</h2>
@@ -1601,60 +1582,60 @@ a F a</code></pre>
 <p>Basis Function Combinator</p>
 <p>Same as a * b.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-65">Definition</h3>
+<h3 id="definition-63">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-34">Derivation</h3>
+<h3 id="derivation-27">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-32">Source</h3>
+<h3 id="source-25">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-64">Discussion</h3>
+<h3 id="discussion-61">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-71">Crosslinks</h3>
+<h3 id="crosslinks-70">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="ne">ne</h2>
 <p>Basis Function Combinator</p>
 <p>Same as a != b.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-66">Definition</h3>
+<h3 id="definition-64">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-35">Derivation</h3>
+<h3 id="derivation-28">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-33">Source</h3>
+<h3 id="source-26">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-65">Discussion</h3>
+<h3 id="discussion-62">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-72">Crosslinks</h3>
+<h3 id="crosslinks-71">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="neg">neg</h2>
 <p>Basis Function Combinator</p>
 <p>Same as -a.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-67">Definition</h3>
+<h3 id="definition-65">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-36">Derivation</h3>
+<h3 id="derivation-29">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-34">Source</h3>
+<h3 id="source-27">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-66">Discussion</h3>
+<h3 id="discussion-63">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-73">Crosslinks</h3>
+<h3 id="crosslinks-72">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="not">not</h2>
 <p>Basis Function Combinator</p>
 <p>Same as not a.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-68">Definition</h3>
+<h3 id="definition-66">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-37">Derivation</h3>
+<h3 id="derivation-30">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-35">Source</h3>
+<h3 id="source-28">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-67">Discussion</h3>
+<h3 id="discussion-64">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-74">Crosslinks</h3>
+<h3 id="crosslinks-73">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="section-26">!-</h2>
@@ -1668,22 +1649,22 @@ a F a</code></pre>
    N !-
 ----------  N &gt;= 0
    true</code></pre>
-<h3 id="definition-69">Definition</h3>
+<h3 id="definition-67">Definition</h3>
 <pre><code>0 &gt;=</code></pre>
 <hr />
 <h2 id="nulco">nulco</h2>
 <p>Basis Function Combinator</p>
 <p>[nullary] cons</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-70">Definition</h3>
+<h3 id="definition-68">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-38">Derivation</h3>
+<h3 id="derivation-31">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-36">Source</h3>
+<h3 id="source-29">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-68">Discussion</h3>
+<h3 id="discussion-65">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-75">Crosslinks</h3>
+<h3 id="crosslinks-74">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="nullary">nullary</h2>
@@ -1692,78 +1673,78 @@ a F a</code></pre>
 <pre><code>   ... [P] nullary
 ---------------------
         ... A</code></pre>
-<h3 id="definition-71">Definition</h3>
+<h3 id="definition-69">Definition</h3>
 <pre><code>[stack] dip infra first</code></pre>
-<h3 id="derivation-39">Derivation</h3>
+<h3 id="derivation-32">Derivation</h3>
 <pre><code>... [P] nullary
 ... [P] [stack] dip infra first
 ... stack [P] infra first
 ... [...] [P] infra first
 ... [A ...] first
 ...  A</code></pre>
-<h3 id="discussion-69">Discussion</h3>
+<h3 id="discussion-66">Discussion</h3>
 <p>A very useful function that runs any other quoted function and returns it&#x2019;s first result without disturbing the stack (under the quoted program.)</p>
-<h3 id="crosslinks-76">Crosslinks</h3>
+<h3 id="crosslinks-75">Crosslinks</h3>
 <p><a href="#unary">unary</a> <a href="#binary">binary</a> <a href="#ternary">ternary</a></p>
 <hr />
 <h2 id="of">of</h2>
 <p>Basis Function Combinator</p>
 <p>swap at</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-72">Definition</h3>
+<h3 id="definition-70">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-40">Derivation</h3>
+<h3 id="derivation-33">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-37">Source</h3>
+<h3 id="source-30">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-70">Discussion</h3>
+<h3 id="discussion-67">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-77">Crosslinks</h3>
+<h3 id="crosslinks-76">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="or">or</h2>
 <p>Basis Function Combinator</p>
 <p>Same as a | b.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-73">Definition</h3>
+<h3 id="definition-71">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-41">Derivation</h3>
+<h3 id="derivation-34">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-38">Source</h3>
+<h3 id="source-31">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-71">Discussion</h3>
+<h3 id="discussion-68">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-78">Crosslinks</h3>
+<h3 id="crosslinks-77">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="over">over</h2>
 <p>Basis Function Combinator</p>
 <pre><code>(a2 a1 -- a2 a1 a2)</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-74">Definition</h3>
+<h3 id="definition-72">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-42">Derivation</h3>
+<h3 id="derivation-35">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-39">Source</h3>
+<h3 id="source-32">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-72">Discussion</h3>
+<h3 id="discussion-69">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-79">Crosslinks</h3>
+<h3 id="crosslinks-78">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="pam">pam</h2>
 <p>Basis Function Combinator</p>
 <p>[i] map</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-75">Definition</h3>
+<h3 id="definition-73">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-43">Derivation</h3>
+<h3 id="derivation-36">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-40">Source</h3>
+<h3 id="source-33">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-73">Discussion</h3>
+<h3 id="discussion-70">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-80">Crosslinks</h3>
+<h3 id="crosslinks-79">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="pick">pick</h2>
@@ -1776,150 +1757,150 @@ a F a</code></pre>
 -------------
 a+b a-b</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-76">Definition</h3>
+<h3 id="definition-74">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-44">Derivation</h3>
+<h3 id="derivation-37">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-41">Source</h3>
+<h3 id="source-34">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-74">Discussion</h3>
+<h3 id="discussion-71">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-81">Crosslinks</h3>
+<h3 id="crosslinks-80">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="pop">pop</h2>
 <p>Basis Function Combinator</p>
 <pre><code>(a1 --)</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-77">Definition</h3>
+<h3 id="definition-75">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-45">Derivation</h3>
+<h3 id="derivation-38">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-42">Source</h3>
+<h3 id="source-35">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-75">Discussion</h3>
+<h3 id="discussion-72">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-82">Crosslinks</h3>
+<h3 id="crosslinks-81">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="popd">popd</h2>
 <p>Basis Function Combinator</p>
 <pre><code>(a2 a1 -- a1)</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-78">Definition</h3>
+<h3 id="definition-76">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-46">Derivation</h3>
+<h3 id="derivation-39">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-43">Source</h3>
+<h3 id="source-36">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-76">Discussion</h3>
+<h3 id="discussion-73">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-83">Crosslinks</h3>
+<h3 id="crosslinks-82">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="popdd">popdd</h2>
 <p>Basis Function Combinator</p>
 <pre><code>(a3 a2 a1 -- a2 a1)</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-79">Definition</h3>
+<h3 id="definition-77">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-47">Derivation</h3>
+<h3 id="derivation-40">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-44">Source</h3>
+<h3 id="source-37">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-77">Discussion</h3>
+<h3 id="discussion-74">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-84">Crosslinks</h3>
+<h3 id="crosslinks-83">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="popop">popop</h2>
 <p>Basis Function Combinator</p>
 <pre><code>(a2 a1 --)</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-80">Definition</h3>
+<h3 id="definition-78">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-48">Derivation</h3>
+<h3 id="derivation-41">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-45">Source</h3>
+<h3 id="source-38">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-78">Discussion</h3>
+<h3 id="discussion-75">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-85">Crosslinks</h3>
+<h3 id="crosslinks-84">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="popopd">popopd</h2>
 <p>Basis Function Combinator</p>
 <pre><code>(a3 a2 a1 -- a1)</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-81">Definition</h3>
+<h3 id="definition-79">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-49">Derivation</h3>
+<h3 id="derivation-42">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-46">Source</h3>
+<h3 id="source-39">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-79">Discussion</h3>
+<h3 id="discussion-76">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-86">Crosslinks</h3>
+<h3 id="crosslinks-85">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="popopdd">popopdd</h2>
 <p>Basis Function Combinator</p>
 <pre><code>(a4 a3 a2 a1 -- a2 a1)</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-82">Definition</h3>
+<h3 id="definition-80">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-50">Derivation</h3>
+<h3 id="derivation-43">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-47">Source</h3>
+<h3 id="source-40">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-80">Discussion</h3>
+<h3 id="discussion-77">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-87">Crosslinks</h3>
+<h3 id="crosslinks-86">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="popopop">popopop</h2>
 <p>Basis Function Combinator</p>
 <p>pop popop</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-83">Definition</h3>
+<h3 id="definition-81">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-51">Derivation</h3>
+<h3 id="derivation-44">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-48">Source</h3>
+<h3 id="source-41">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-81">Discussion</h3>
+<h3 id="discussion-78">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-88">Crosslinks</h3>
+<h3 id="crosslinks-87">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="pow">pow</h2>
 <p>Basis Function Combinator</p>
 <p>Same as a ** b.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-84">Definition</h3>
+<h3 id="definition-82">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-52">Derivation</h3>
+<h3 id="derivation-45">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-49">Source</h3>
+<h3 id="source-42">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-82">Discussion</h3>
+<h3 id="discussion-79">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-89">Crosslinks</h3>
+<h3 id="crosslinks-88">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="pred">pred</h2>
 <p>Basis Function Combinator</p>
 <p>Decrement TOS.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-85">Definition</h3>
+<h3 id="definition-83">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-53">Derivation</h3>
+<h3 id="derivation-46">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-50">Source</h3>
+<h3 id="source-43">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-83">Discussion</h3>
+<h3 id="discussion-80">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-90">Crosslinks</h3>
+<h3 id="crosslinks-89">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="primrec">primrec</h2>
@@ -1938,90 +1919,90 @@ a+b a-b</code></pre>
 ------------------------------------------ n &gt; 0
    n (n-1) [Base] [Recur] primrec Recur</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-86">Definition</h3>
+<h3 id="definition-84">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-54">Derivation</h3>
+<h3 id="derivation-47">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-51">Source</h3>
+<h3 id="source-44">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-84">Discussion</h3>
+<h3 id="discussion-81">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-91">Crosslinks</h3>
+<h3 id="crosslinks-90">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="product">product</h2>
 <p>Basis Function Combinator</p>
 <p>1 swap [*] step</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-87">Definition</h3>
+<h3 id="definition-85">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-55">Derivation</h3>
+<h3 id="derivation-48">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-52">Source</h3>
+<h3 id="source-45">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-85">Discussion</h3>
+<h3 id="discussion-82">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-92">Crosslinks</h3>
+<h3 id="crosslinks-91">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="quoted">quoted</h2>
 <p>Basis Function Combinator</p>
 <p>[unit] dip</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-88">Definition</h3>
+<h3 id="definition-86">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-56">Derivation</h3>
+<h3 id="derivation-49">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-53">Source</h3>
+<h3 id="source-46">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-86">Discussion</h3>
+<h3 id="discussion-83">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-93">Crosslinks</h3>
+<h3 id="crosslinks-92">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="range">range</h2>
 <p>Basis Function Combinator</p>
 <p>[0 &lt;=] [1 - dup] anamorphism</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-89">Definition</h3>
+<h3 id="definition-87">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-57">Derivation</h3>
+<h3 id="derivation-50">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-54">Source</h3>
+<h3 id="source-47">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-87">Discussion</h3>
+<h3 id="discussion-84">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-94">Crosslinks</h3>
+<h3 id="crosslinks-93">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="range_to_zero">range_to_zero</h2>
 <p>Basis Function Combinator</p>
 <p>unit [down_to_zero] infra</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-90">Definition</h3>
+<h3 id="definition-88">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-58">Derivation</h3>
+<h3 id="derivation-51">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-55">Source</h3>
+<h3 id="source-48">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-88">Discussion</h3>
+<h3 id="discussion-85">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-95">Crosslinks</h3>
+<h3 id="crosslinks-94">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="reco">reco</h2>
 <p>Basis Function Combinator</p>
 <p>rest cons</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-91">Definition</h3>
+<h3 id="definition-89">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-59">Derivation</h3>
+<h3 id="derivation-52">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-56">Source</h3>
+<h3 id="source-49">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-89">Discussion</h3>
+<h3 id="discussion-86">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-96">Crosslinks</h3>
+<h3 id="crosslinks-95">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="rem">rem</h2>
@@ -2037,30 +2018,30 @@ a+b a-b</code></pre>
 ------------------------
   [2 3 1]</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-92">Definition</h3>
+<h3 id="definition-90">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-60">Derivation</h3>
+<h3 id="derivation-53">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-57">Source</h3>
+<h3 id="source-50">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-90">Discussion</h3>
+<h3 id="discussion-87">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-97">Crosslinks</h3>
+<h3 id="crosslinks-96">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="rest">rest</h2>
 <p>Basis Function Combinator</p>
 <pre><code>([a1 ...0] -- [...0])</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-93">Definition</h3>
+<h3 id="definition-91">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-61">Derivation</h3>
+<h3 id="derivation-54">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-58">Source</h3>
+<h3 id="source-51">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-91">Discussion</h3>
+<h3 id="discussion-88">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-98">Crosslinks</h3>
+<h3 id="crosslinks-97">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="reverse">reverse</h2>
@@ -2068,45 +2049,45 @@ a+b a-b</code></pre>
 <p>Reverse the list on the top of the stack. :</p>
 <pre><code>reverse == [] swap shunt</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-94">Definition</h3>
+<h3 id="definition-92">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-62">Derivation</h3>
+<h3 id="derivation-55">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-59">Source</h3>
+<h3 id="source-52">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-92">Discussion</h3>
+<h3 id="discussion-89">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-99">Crosslinks</h3>
+<h3 id="crosslinks-98">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="rolldown">rolldown</h2>
 <p>Basis Function Combinator</p>
 <pre><code>(a1 a2 a3 -- a2 a3 a1)</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-95">Definition</h3>
+<h3 id="definition-93">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-63">Derivation</h3>
+<h3 id="derivation-56">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-60">Source</h3>
+<h3 id="source-53">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-93">Discussion</h3>
+<h3 id="discussion-90">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-100">Crosslinks</h3>
+<h3 id="crosslinks-99">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="rollup">rollup</h2>
 <p>Basis Function Combinator</p>
 <pre><code>(a1 a2 a3 -- a3 a1 a2)</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-96">Definition</h3>
+<h3 id="definition-94">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-64">Derivation</h3>
+<h3 id="derivation-57">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-61">Source</h3>
+<h3 id="source-54">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-94">Discussion</h3>
+<h3 id="discussion-91">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-101">Crosslinks</h3>
+<h3 id="crosslinks-100">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="roll">roll&gt;</h2>
@@ -2120,75 +2101,75 @@ a+b a-b</code></pre>
 <p>Round a number to a given precision in decimal digits.</p>
 <p>The return value is an integer if ndigits is omitted or None. Otherwise the return value has the same type as the number. ndigits may be negative.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-97">Definition</h3>
+<h3 id="definition-95">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-65">Derivation</h3>
+<h3 id="derivation-58">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-62">Source</h3>
+<h3 id="source-55">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-95">Discussion</h3>
+<h3 id="discussion-92">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-102">Crosslinks</h3>
+<h3 id="crosslinks-101">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="rrest">rrest</h2>
 <p>Basis Function Combinator</p>
 <pre><code>([a1 a2 ...1] -- [...1])</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-98">Definition</h3>
+<h3 id="definition-96">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-66">Derivation</h3>
+<h3 id="derivation-59">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-63">Source</h3>
+<h3 id="source-56">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-96">Discussion</h3>
+<h3 id="discussion-93">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-103">Crosslinks</h3>
+<h3 id="crosslinks-102">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="rshift">rshift</h2>
 <p>Basis Function Combinator</p>
 <p>Same as a &gt;&gt; b.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-99">Definition</h3>
+<h3 id="definition-97">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-67">Derivation</h3>
+<h3 id="derivation-60">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-64">Source</h3>
+<h3 id="source-57">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-97">Discussion</h3>
+<h3 id="discussion-94">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-104">Crosslinks</h3>
+<h3 id="crosslinks-103">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="run">run</h2>
 <p>Basis Function Combinator</p>
 <p>&lt;{} infra</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-100">Definition</h3>
+<h3 id="definition-98">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-68">Derivation</h3>
+<h3 id="derivation-61">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-65">Source</h3>
+<h3 id="source-58">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-98">Discussion</h3>
+<h3 id="discussion-95">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-105">Crosslinks</h3>
+<h3 id="crosslinks-104">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="second">second</h2>
 <p>Basis Function Combinator</p>
 <pre><code>([a1 a2 ...1] -- a2)</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-101">Definition</h3>
+<h3 id="definition-99">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-69">Derivation</h3>
+<h3 id="derivation-62">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-66">Source</h3>
+<h3 id="source-59">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-99">Discussion</h3>
+<h3 id="discussion-96">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-106">Crosslinks</h3>
+<h3 id="crosslinks-105">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="select">select</h2>
@@ -2204,45 +2185,45 @@ a+b a-b</code></pre>
    B</code></pre>
 <p>The sequence can contain more than two items but not fewer. Currently Python semantics are used to evaluate the "truthiness" of the Boolean value (so empty string, zero, etc. are counted as false, etc.)</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-102">Definition</h3>
+<h3 id="definition-100">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-70">Derivation</h3>
+<h3 id="derivation-63">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-67">Source</h3>
+<h3 id="source-60">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-100">Discussion</h3>
+<h3 id="discussion-97">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-107">Crosslinks</h3>
+<h3 id="crosslinks-106">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="sharing">sharing</h2>
 <p>Basis Function Combinator</p>
 <p>Print redistribution information.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-103">Definition</h3>
+<h3 id="definition-101">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-71">Derivation</h3>
+<h3 id="derivation-64">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-68">Source</h3>
+<h3 id="source-61">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-101">Discussion</h3>
+<h3 id="discussion-98">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-108">Crosslinks</h3>
+<h3 id="crosslinks-107">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="shift">shift</h2>
 <p>Basis Function Combinator</p>
 <p>uncons [swons] dip</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-104">Definition</h3>
+<h3 id="definition-102">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-72">Derivation</h3>
+<h3 id="derivation-65">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-69">Source</h3>
+<h3 id="source-62">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-102">Discussion</h3>
+<h3 id="discussion-99">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-109">Crosslinks</h3>
+<h3 id="crosslinks-108">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="shunt">shunt</h2>
@@ -2254,150 +2235,150 @@ a+b a-b</code></pre>
 ---------------------------
        [f e d a b c] </code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-105">Definition</h3>
+<h3 id="definition-103">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-73">Derivation</h3>
+<h3 id="derivation-66">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-70">Source</h3>
+<h3 id="source-63">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-103">Discussion</h3>
+<h3 id="discussion-100">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-110">Crosslinks</h3>
+<h3 id="crosslinks-109">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="size">size</h2>
 <p>Basis Function Combinator</p>
 <p>[pop ++] step_zero</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-106">Definition</h3>
+<h3 id="definition-104">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-74">Derivation</h3>
+<h3 id="derivation-67">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-71">Source</h3>
+<h3 id="source-64">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-104">Discussion</h3>
+<h3 id="discussion-101">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-111">Crosslinks</h3>
+<h3 id="crosslinks-110">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="sort">sort</h2>
 <p>Basis Function Combinator</p>
 <p>Given a list return it sorted.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-107">Definition</h3>
+<h3 id="definition-105">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-75">Derivation</h3>
+<h3 id="derivation-68">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-72">Source</h3>
+<h3 id="source-65">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-105">Discussion</h3>
+<h3 id="discussion-102">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-112">Crosslinks</h3>
+<h3 id="crosslinks-111">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="spiral_next">spiral_next</h2>
 <p>Basis Function Combinator</p>
 <p>[[[abs] ii &lt;=] [[&lt;&gt;] [pop !-] ||] &amp;&amp;] [[!-] [[++]] [[--]] ifte dip] [[pop !-] [--] [++] ifte] ifte</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-108">Definition</h3>
+<h3 id="definition-106">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-76">Derivation</h3>
+<h3 id="derivation-69">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-73">Source</h3>
+<h3 id="source-66">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-106">Discussion</h3>
+<h3 id="discussion-103">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-113">Crosslinks</h3>
+<h3 id="crosslinks-112">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="split_at">split_at</h2>
 <p>Basis Function Combinator</p>
 <p>[drop] [take] clop</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-109">Definition</h3>
+<h3 id="definition-107">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-77">Derivation</h3>
+<h3 id="derivation-70">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-74">Source</h3>
+<h3 id="source-67">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-107">Discussion</h3>
+<h3 id="discussion-104">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-114">Crosslinks</h3>
+<h3 id="crosslinks-113">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="split_list">split_list</h2>
 <p>Basis Function Combinator</p>
 <p>[take reverse] [drop] clop</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-110">Definition</h3>
+<h3 id="definition-108">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-78">Derivation</h3>
+<h3 id="derivation-71">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-75">Source</h3>
+<h3 id="source-68">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-108">Discussion</h3>
+<h3 id="discussion-105">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-115">Crosslinks</h3>
+<h3 id="crosslinks-114">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="sqr">sqr</h2>
 <p>Basis Function Combinator</p>
 <p>dup *</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-111">Definition</h3>
+<h3 id="definition-109">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-79">Derivation</h3>
+<h3 id="derivation-72">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-76">Source</h3>
+<h3 id="source-69">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-109">Discussion</h3>
+<h3 id="discussion-106">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-116">Crosslinks</h3>
+<h3 id="crosslinks-115">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="sqrt">sqrt</h2>
 <p>Basis Function Combinator</p>
 <p>Return the square root of the number a. Negative numbers return complex roots.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-112">Definition</h3>
+<h3 id="definition-110">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-80">Derivation</h3>
+<h3 id="derivation-73">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-77">Source</h3>
+<h3 id="source-70">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-110">Discussion</h3>
+<h3 id="discussion-107">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-117">Crosslinks</h3>
+<h3 id="crosslinks-116">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="stack">stack</h2>
 <p>Basis Function Combinator</p>
 <pre><code>(... -- ... [...])</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-113">Definition</h3>
+<h3 id="definition-111">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-81">Derivation</h3>
+<h3 id="derivation-74">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-78">Source</h3>
+<h3 id="source-71">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-111">Discussion</h3>
+<h3 id="discussion-108">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-118">Crosslinks</h3>
+<h3 id="crosslinks-117">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="stackd">stackd</h2>
 <p>Basis Function Combinator</p>
 <p>[stack] dip</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-114">Definition</h3>
+<h3 id="definition-112">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-82">Derivation</h3>
+<h3 id="derivation-75">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-79">Source</h3>
+<h3 id="source-72">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-112">Discussion</h3>
+<h3 id="discussion-109">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-119">Crosslinks</h3>
+<h3 id="crosslinks-118">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="step">step</h2>
@@ -2418,90 +2399,90 @@ a+b a-b</code></pre>
       ... a . Q [b c] [Q] step</code></pre>
 <p>The step combinator executes the quotation on each member of the list on top of the stack.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-115">Definition</h3>
+<h3 id="definition-113">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-83">Derivation</h3>
+<h3 id="derivation-76">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-80">Source</h3>
+<h3 id="source-73">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-113">Discussion</h3>
+<h3 id="discussion-110">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-120">Crosslinks</h3>
+<h3 id="crosslinks-119">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="step_zero">step_zero</h2>
 <p>Basis Function Combinator</p>
 <p>0 roll&gt; step</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-116">Definition</h3>
+<h3 id="definition-114">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-84">Derivation</h3>
+<h3 id="derivation-77">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-81">Source</h3>
+<h3 id="source-74">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-114">Discussion</h3>
+<h3 id="discussion-111">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-121">Crosslinks</h3>
+<h3 id="crosslinks-120">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="stuncons">stuncons</h2>
 <p>Basis Function Combinator</p>
 <pre><code>(... a1 -- ... a1 a1 [...])</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-117">Definition</h3>
+<h3 id="definition-115">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-85">Derivation</h3>
+<h3 id="derivation-78">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-82">Source</h3>
+<h3 id="source-75">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-115">Discussion</h3>
+<h3 id="discussion-112">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-122">Crosslinks</h3>
+<h3 id="crosslinks-121">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="stununcons">stununcons</h2>
 <p>Basis Function Combinator</p>
 <pre><code>(... a2 a1 -- ... a2 a1 a1 a2 [...])</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-118">Definition</h3>
+<h3 id="definition-116">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-86">Derivation</h3>
+<h3 id="derivation-79">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-83">Source</h3>
+<h3 id="source-76">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-116">Discussion</h3>
+<h3 id="discussion-113">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-123">Crosslinks</h3>
+<h3 id="crosslinks-122">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="sub">sub</h2>
 <p>Basis Function Combinator</p>
 <p>Same as a - b.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-119">Definition</h3>
+<h3 id="definition-117">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-87">Derivation</h3>
+<h3 id="derivation-80">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-84">Source</h3>
+<h3 id="source-77">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-117">Discussion</h3>
+<h3 id="discussion-114">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-124">Crosslinks</h3>
+<h3 id="crosslinks-123">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="succ">succ</h2>
 <p>Basis Function Combinator</p>
 <p>Increment TOS.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-120">Definition</h3>
+<h3 id="definition-118">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-88">Derivation</h3>
+<h3 id="derivation-81">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-85">Source</h3>
+<h3 id="source-78">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-118">Discussion</h3>
+<h3 id="discussion-115">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-125">Crosslinks</h3>
+<h3 id="crosslinks-124">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="sum">sum</h2>
@@ -2509,105 +2490,105 @@ a+b a-b</code></pre>
 <p>Given a quoted sequence of numbers return the sum. :</p>
 <pre><code>sum == 0 swap [+] step</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-121">Definition</h3>
+<h3 id="definition-119">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-89">Derivation</h3>
+<h3 id="derivation-82">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-86">Source</h3>
+<h3 id="source-79">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-119">Discussion</h3>
+<h3 id="discussion-116">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-126">Crosslinks</h3>
+<h3 id="crosslinks-125">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="swaack">swaack</h2>
 <p>Basis Function Combinator</p>
 <pre><code>([...1] -- [...0])</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-122">Definition</h3>
+<h3 id="definition-120">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-90">Derivation</h3>
+<h3 id="derivation-83">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-87">Source</h3>
+<h3 id="source-80">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-120">Discussion</h3>
+<h3 id="discussion-117">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-127">Crosslinks</h3>
+<h3 id="crosslinks-126">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="swap">swap</h2>
 <p>Basis Function Combinator</p>
 <pre><code>(a1 a2 -- a2 a1)</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-123">Definition</h3>
+<h3 id="definition-121">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-91">Derivation</h3>
+<h3 id="derivation-84">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-88">Source</h3>
+<h3 id="source-81">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-121">Discussion</h3>
+<h3 id="discussion-118">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-128">Crosslinks</h3>
+<h3 id="crosslinks-127">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="swapd">swapd</h2>
 <p>Basis Function Combinator</p>
 <p>[swap] dip</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-124">Definition</h3>
+<h3 id="definition-122">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-92">Derivation</h3>
+<h3 id="derivation-85">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-89">Source</h3>
+<h3 id="source-82">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-122">Discussion</h3>
+<h3 id="discussion-119">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-129">Crosslinks</h3>
+<h3 id="crosslinks-128">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="swoncat">swoncat</h2>
 <p>Basis Function Combinator</p>
 <p>swap concat</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-125">Definition</h3>
+<h3 id="definition-123">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-93">Derivation</h3>
+<h3 id="derivation-86">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-90">Source</h3>
+<h3 id="source-83">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-123">Discussion</h3>
+<h3 id="discussion-120">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-130">Crosslinks</h3>
+<h3 id="crosslinks-129">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="swons">swons</h2>
 <p>Basis Function Combinator</p>
 <pre><code>([...1] a1 -- [a1 ...1])</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-126">Definition</h3>
+<h3 id="definition-124">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-94">Derivation</h3>
+<h3 id="derivation-87">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-91">Source</h3>
+<h3 id="source-84">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-124">Discussion</h3>
+<h3 id="discussion-121">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-131">Crosslinks</h3>
+<h3 id="crosslinks-130">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="tailrec">tailrec</h2>
 <p>Basis Function Combinator</p>
 <p>[i] genrec</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-127">Definition</h3>
+<h3 id="definition-125">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-95">Derivation</h3>
+<h3 id="derivation-88">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-92">Source</h3>
+<h3 id="source-85">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-125">Discussion</h3>
+<h3 id="discussion-122">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-132">Crosslinks</h3>
+<h3 id="crosslinks-131">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="take">take</h2>
@@ -2617,15 +2598,15 @@ a+b a-b</code></pre>
 ----------------------
     [b a]</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-128">Definition</h3>
+<h3 id="definition-126">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-96">Derivation</h3>
+<h3 id="derivation-89">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-93">Source</h3>
+<h3 id="source-86">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-126">Discussion</h3>
+<h3 id="discussion-123">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-133">Crosslinks</h3>
+<h3 id="crosslinks-132">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="ternary">ternary</h2>
@@ -2634,26 +2615,26 @@ a+b a-b</code></pre>
 <pre><code>   ... z y x [P] unary
 -------------------------
          ... A</code></pre>
-<h3 id="definition-129">Definition</h3>
+<h3 id="definition-127">Definition</h3>
 <pre><code>binary popd</code></pre>
-<h3 id="discussion-127">Discussion</h3>
+<h3 id="discussion-124">Discussion</h3>
 <p>Runs any other quoted function and returns its first result while consuming exactly three items from the stack.</p>
-<h3 id="crosslinks-134">Crosslinks</h3>
+<h3 id="crosslinks-133">Crosslinks</h3>
 <p><a href="#binary">binary</a> <a href="#nullary">nullary</a> <a href="#unary">unary</a></p>
 <hr />
 <h2 id="third">third</h2>
 <p>Basis Function Combinator</p>
 <pre><code>([a1 a2 a3 ...1] -- a3)</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-130">Definition</h3>
+<h3 id="definition-128">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-97">Derivation</h3>
+<h3 id="derivation-90">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-94">Source</h3>
+<h3 id="source-87">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-128">Discussion</h3>
+<h3 id="discussion-125">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-135">Crosslinks</h3>
+<h3 id="crosslinks-134">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="times">times</h2>
@@ -2673,15 +2654,15 @@ a+b a-b</code></pre>
 -------------------------------------  w/ n &gt; 1
   ... . Q (n - 1) [Q] times</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-131">Definition</h3>
+<h3 id="definition-129">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-98">Derivation</h3>
+<h3 id="derivation-91">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-95">Source</h3>
+<h3 id="source-88">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-129">Discussion</h3>
+<h3 id="discussion-126">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-136">Crosslinks</h3>
+<h3 id="crosslinks-135">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="truthy">truthy</h2>
@@ -2691,15 +2672,15 @@ a+b a-b</code></pre>
 <p>Basis Function Combinator</p>
 <pre><code>(a2 a1 -- a1 a2 a1)</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-132">Definition</h3>
+<h3 id="definition-130">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-99">Derivation</h3>
+<h3 id="derivation-92">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-96">Source</h3>
+<h3 id="source-89">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-130">Discussion</h3>
+<h3 id="discussion-127">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-137">Crosslinks</h3>
+<h3 id="crosslinks-136">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="unary">unary</h2>
@@ -2708,11 +2689,11 @@ a+b a-b</code></pre>
 <pre><code>   ... x [P] unary
 ---------------------
        ... A</code></pre>
-<h3 id="definition-133">Definition</h3>
+<h3 id="definition-131">Definition</h3>
 <pre><code>nullary popd</code></pre>
-<h3 id="discussion-131">Discussion</h3>
+<h3 id="discussion-128">Discussion</h3>
 <p>Runs any other quoted function and returns its first result while consuming exactly one item from the stack.</p>
-<h3 id="crosslinks-138">Crosslinks</h3>
+<h3 id="crosslinks-137">Crosslinks</h3>
 <p><a href="#binary">binary</a> <a href="#nullary">nullary</a> <a href="#ternary">ternary</a></p>
 <hr />
 <h2 id="uncons">uncons</h2>
@@ -2721,131 +2702,131 @@ a+b a-b</code></pre>
 <pre><code>   [A ...] uncons
 --------------------
       A [...]</code></pre>
-<h3 id="source-97">Source</h3>
+<h3 id="source-90">Source</h3>
 <pre><code>func(uncons, Si, So) :- func(cons, So, Si).</code></pre>
-<h3 id="discussion-132">Discussion</h3>
+<h3 id="discussion-129">Discussion</h3>
 <p>This is the inverse of <code>cons</code>.</p>
-<h3 id="crosslinks-139">Crosslinks</h3>
+<h3 id="crosslinks-138">Crosslinks</h3>
 <p><a href="#cons">cons</a></p>
 <hr />
 <h2 id="unique">unique</h2>
 <p>Basis Function Combinator</p>
 <p>Given a list remove duplicate items.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-134">Definition</h3>
+<h3 id="definition-132">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-100">Derivation</h3>
+<h3 id="derivation-93">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-98">Source</h3>
+<h3 id="source-91">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-133">Discussion</h3>
+<h3 id="discussion-130">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-140">Crosslinks</h3>
+<h3 id="crosslinks-139">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="unit">unit</h2>
 <p>Basis Function Combinator</p>
 <pre><code>(a1 -- [a1 ])</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-135">Definition</h3>
+<h3 id="definition-133">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-101">Derivation</h3>
+<h3 id="derivation-94">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-99">Source</h3>
+<h3 id="source-92">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-134">Discussion</h3>
+<h3 id="discussion-131">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-141">Crosslinks</h3>
+<h3 id="crosslinks-140">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="unquoted">unquoted</h2>
 <p>Basis Function Combinator</p>
 <p>[i] dip</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-136">Definition</h3>
+<h3 id="definition-134">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-102">Derivation</h3>
+<h3 id="derivation-95">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-100">Source</h3>
+<h3 id="source-93">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-135">Discussion</h3>
+<h3 id="discussion-132">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-142">Crosslinks</h3>
+<h3 id="crosslinks-141">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="unswons">unswons</h2>
 <p>Basis Function Combinator</p>
 <pre><code>([a1 ...1] -- [...1] a1)</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-137">Definition</h3>
+<h3 id="definition-135">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-103">Derivation</h3>
+<h3 id="derivation-96">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-101">Source</h3>
+<h3 id="source-94">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-136">Discussion</h3>
+<h3 id="discussion-133">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-143">Crosslinks</h3>
+<h3 id="crosslinks-142">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="void">void</h2>
 <p>Basis Function Combinator</p>
 <p>True if the form on TOS is void otherwise False.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-138">Definition</h3>
+<h3 id="definition-136">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-104">Derivation</h3>
+<h3 id="derivation-97">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-102">Source</h3>
+<h3 id="source-95">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-137">Discussion</h3>
+<h3 id="discussion-134">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-144">Crosslinks</h3>
+<h3 id="crosslinks-143">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="warranty">warranty</h2>
 <p>Basis Function Combinator</p>
 <p>Print warranty information.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-139">Definition</h3>
+<h3 id="definition-137">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-105">Derivation</h3>
+<h3 id="derivation-98">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-103">Source</h3>
+<h3 id="source-96">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-138">Discussion</h3>
+<h3 id="discussion-135">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-145">Crosslinks</h3>
+<h3 id="crosslinks-144">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="while">while</h2>
 <p>Basis Function Combinator</p>
 <p>swap nulco dupdipd concat loop</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-140">Definition</h3>
+<h3 id="definition-138">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-106">Derivation</h3>
+<h3 id="derivation-99">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-104">Source</h3>
+<h3 id="source-97">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-139">Discussion</h3>
+<h3 id="discussion-136">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-146">Crosslinks</h3>
+<h3 id="crosslinks-145">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="words">words</h2>
 <p>Basis Function Combinator</p>
 <p>Print all the words in alphabetical order.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-141">Definition</h3>
+<h3 id="definition-139">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-107">Derivation</h3>
+<h3 id="derivation-100">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-105">Source</h3>
+<h3 id="source-98">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-140">Discussion</h3>
+<h3 id="discussion-137">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-147">Crosslinks</h3>
+<h3 id="crosslinks-146">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="x">x</h2>
@@ -2853,39 +2834,39 @@ a+b a-b</code></pre>
 <pre><code>   [F] x
 -----------
    [F] F</code></pre>
-<h3 id="definition-142">Definition</h3>
+<h3 id="definition-140">Definition</h3>
 <pre><code>dup i</code></pre>
-<h3 id="discussion-141">Discussion</h3>
+<h3 id="discussion-138">Discussion</h3>
 <p>The <code>x</code> combinator &#x2026;</p>
 <hr />
 <h2 id="xor">xor</h2>
 <p>Basis Function Combinator</p>
 <p>Same as a ^ b.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-143">Definition</h3>
+<h3 id="definition-141">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-108">Derivation</h3>
+<h3 id="derivation-101">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-106">Source</h3>
+<h3 id="source-99">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-142">Discussion</h3>
+<h3 id="discussion-139">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-148">Crosslinks</h3>
+<h3 id="crosslinks-147">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="zip">zip</h2>
 <p>Basis Function Combinator</p>
 <p>Replace the two lists on the top of the stack with a list of the pairs from each list. The smallest list sets the length of the result list.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-144">Definition</h3>
+<h3 id="definition-142">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-109">Derivation</h3>
+<h3 id="derivation-102">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-107">Source</h3>
+<h3 id="source-100">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-143">Discussion</h3>
+<h3 id="discussion-140">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-149">Crosslinks</h3>
+<h3 id="crosslinks-148">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 </body>
 </html>
diff --git a/docs/reference/mkref/Functor-Reference.md b/docs/reference/mkref/Functor-Reference.md
index f901c6c..e7f9cf2 100644
--- a/docs/reference/mkref/Functor-Reference.md
+++ b/docs/reference/mkref/Functor-Reference.md
@@ -1397,213 +1397,184 @@ Lorem ipsum.
 
 ## first
 
-Basis Function Combinator
+Function
 
-    ([a1 ...1] -- a1)
+Replace a list with its first item.
 
-Gentzen diagram.
+       [a ...]
+    --------------
+          a
 
 ### Definition
 
-if not basis.
-
-### Derivation
-
-if not basis.
-
-### Source
-
-if basis
-
-### Discussion
-
-Lorem ipsum.
+> [uncons] [pop]
 
 ### Crosslinks
 
-Lorem ipsum.
+[second]
+[third]
+[fourth]
+[rest]
+
 
 ------------------------------------------------------------------------
 
 ## first_two
 
-Basis Function Combinator
+Function
 
-    ([a1 a2 ...1] -- a1 a2)
+Replace a list with its first two items.
 
-Gentzen diagram.
+       [a b ...] first_two
+    -------------------------
+               a b
 
 ### Definition
 
-if not basis.
-
-### Derivation
-
-if not basis.
-
-### Source
-
-if basis
-
-### Discussion
-
-Lorem ipsum.
+> [uncons] [first]
 
 ### Crosslinks
 
-Lorem ipsum.
+[first]
+[second]
+[third]
+[fourth]
+[rest]
+
 
 ------------------------------------------------------------------------
 
 ## flatten
 
-Basis Function Combinator
+Function
 
-\<{} \[concat\] step
+Given a list of lists, concatinate them.
 
-Gentzen diagram.
+### Example
+
+       [[1 2] [3 [4] 5] [6 7]] flatten
+    -------------------------------------
+              [1 2 3 [4] 5 6 7]
 
 ### Definition
 
-if not basis.
-
-### Derivation
-
-if not basis.
-
-### Source
-
-if basis
+> [\<\{\}] \[[concat]\] [step]
 
 ### Discussion
 
-Lorem ipsum.
+Note that only one "level" of lists is flattened.  In the example above
+`[4]` is not unquoted.
 
 ### Crosslinks
 
-Lorem ipsum.
+[concat]
+[first]
+[first_two]
+[fourth]
+[getitem]
+[remove]
+[rest]
+[reverse]
+[rrest]
+[second]
+[shift]
+[shunt]
+[size]
+[sort]
+[split_at]
+[split_list]
+[swaack]
+[third]
+[zip]
+
 
 ------------------------------------------------------------------------
 
 ## floor
 
-Basis Function Combinator
+Basis Function
 
-Return the floor of x as an Integral.
-
-This is the largest integer \<= x.
-
-Gentzen diagram.
-
-### Definition
-
-if not basis.
-
-### Derivation
-
-if not basis.
-
-### Source
-
-if basis
+Return the largest integer \<= x.
 
 ### Discussion
 
-Lorem ipsum.
+This function doesn't make sense (yet) to have because there are (as yet)
+only integers in the system.
 
-### Crosslinks
-
-Lorem ipsum.
 
 ------------------------------------------------------------------------
 
 ## floordiv
 
-Basis Function Combinator
+Basis Function
 
-Same as a // b.
+I don't know why this is called "floor" div, I think it rounds its
+result down (not towards zero or up.)
 
-Gentzen diagram.
-
-### Definition
-
-if not basis.
-
-### Derivation
-
-if not basis.
-
-### Source
-
-if basis
+       a b floordiv
+    ------------------
+          (a/b)
 
 ### Discussion
 
-Lorem ipsum.
+All the division commands need to be revisited when the "numeric tower"
+for Thun gets nailed down.
 
 ### Crosslinks
 
-Lorem ipsum.
+[divmod]
+
 
 ------------------------------------------------------------------------
 
 ## fork
 
-Basis Function Combinator
+Combinator
 
-\[i\] app2
+Run two quoted programs in parallel and replace them with their results.
 
-Gentzen diagram.
+       ... [F] [G] fork
+    ----------------------
+           ... f g
 
 ### Definition
 
-if not basis.
-
-### Derivation
-
-if not basis.
-
-### Source
-
-if basis
+> \[[i]\] [app2]
 
 ### Discussion
 
-Lorem ipsum.
+The basic parallelism combinator, the two programs are run independently.
 
 ### Crosslinks
 
-Lorem ipsum.
+[cleave]
+[clop]
+[map]
+
 
 ------------------------------------------------------------------------
 
 ## fourth
 
-Basis Function Combinator
+Function
 
-    ([a1 a2 a3 a4 ...1] -- a4)
+Replace a list with its fourth item.
 
-Gentzen diagram.
+       [a b c d ...] fourth
+    --------------------------
+              d
 
 ### Definition
 
-if not basis.
-
-### Derivation
-
-if not basis.
-
-### Source
-
-if basis
-
-### Discussion
-
-Lorem ipsum.
+> [rest] [third]
 
 ### Crosslinks
 
-Lorem ipsum.
+[first]
+[second]
+[third]
+[rest]
+
 
 ------------------------------------------------------------------------